Excel on mobile phone

I have been having this issue for a couple years now, and quite frankly fed up. I am using a Windows 8 Lumina Icon on Verizon. This issue however seems to have nothing to do with the phone (s) and or Verizon. As near as I can tell it appears to be an issue with ?????????

Ok the issue
When out and about, say grocery shopping or whatever, I am not been able to open Excel from SkyDrive, and now OneDrive, whilst connected to a stores WiFi. I can however open the app from OneDrive while on my home WiFi. In order to use Excel while out, I either have to open it prior to leaving, or turn my WiFi completely off it has already connected, or if it hasn't connected, don't connect and use my providers 4G service.

Any Ideas?

John

Thanks John
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